A Green Paper on Sustainable Energy published by the Department of Public Enterprise proposed the introduction of a carbon or energy tax scheme along with a tradable permit system to provide an incentive for industry to reduce emissions. One possibility discussed in the paper is to use revenue generated from a carbon tax or permit scheme to fund grants for energy audits and investments in energy equipment. The Green Paper set targets for renewable energy sources in Ireland: - Increasing the percentage of total primary energy requirement (TPER) to be derived from renewable energy sources to 3.75% by 2005 from 2% in 2000. - Increasing the percentage of electricity generated from renewable sources from 6.3% in 2000 to 12.39% by 2005. This includes installing an extra 500 MW of renewable electricity capacity by 2005.